In 2176.
The Buenos Aires Obelisk is a man made structure in Argentina. It was made in 1936 to celebrate the city's 400th anniversary. It stands about 220 feet tall.
There is not 400th element. So far we only have up to element 118: ununoctium
799.
0.0025
The town was going to celerbrate their first millennium aniversity ever.
799 would be the 400th odd number even if '1' were not the first one.
The 20th Wedding Anniversary is when you would typically give china as a gift.
Ken Griffey Jr. was 30 years old when he hit his 400th home run.
No only the US and Canada celebrate it.
to celebrate why Jesus died for us.
That Is The Date That It Was First Signed Many Moons Ago, So Its Like An Aniversity Thing. This Is Probably One Document That Is Most Important For The United States Of America.
st.patricks day